Ouch, a stomach bug is definitely not a holiday, as the two of us also had it a few times now. Nausea, diarrhea, cramps and a lot of other issues. It's a horrible thing and even fasting doesn't help. Plain white toast with a bit of butter and no dairy and only water helps a bit, but one just has to suffer it out. Medazine nausea tablets help for nausea, and the best for stomach cramps is Scopex tablets. Bicarb takes the toxin away.
Hope that you get better soon.